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/*
* Copyright (c) 2002, 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* Lookup/reverse lookup class for regression test 4773521
* @test
* @bug 4773521
* @summary Test that reverse lookups of IPv4 addresses work when IPv6
* is enabled
* @library /test/lib
* @build jdk.test.lib.Utils
* jdk.test.lib.Asserts
* jdk.test.lib.JDKToolFinder
* jdk.test.lib.JDKToolLauncher
* jdk.test.lib.Platform
* jdk.test.lib.process.*
* Lookup
* @run main Lookup root
*
*/
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.stream.Stream;
import java.util.stream.Collectors;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.process.ProcessTools;
public class Lookup {
private static final String HOST = "icann.org";
private static final String SKIP = "SKIP";
public static void main(String args[]) throws IOException {
String addr = null;
String ipv4Name = null;
String ipv4Reversed = null;
if (args.length == 0) {
// called from lookupWithIPv4Prefer
// obtain an IPv4 address from the hostname.
try {
InetAddress ia = InetAddress.getByName(HOST);
addr = ia.getHostAddress();
ia = InetAddress.getByName(addr);
System.out.print(addr + ":" + ia.getHostName());
return;
} catch (UnknownHostException e) {
System.out.print(SKIP);
return;
}
} else if (args.length == 2 && args[0].equals("reverse")) {
// called from reverseWithIPv4Prefer
// Check that IPv4 address can be resolved to host
// with -Djava.net.preferIPv4Stack=true
try {
InetAddress ia = InetAddress.getByName(args[1]);
addr = ia.getHostAddress();
ipv4Reversed = ia.getHostName();
System.out.print(addr + ":" + ipv4Reversed);
return;
} catch (UnknownHostException e) {
System.out.print(SKIP);
return;
}
} else if (args.length != 1 || !args[0].equals("root")) {
throw new IllegalArgumentException(Stream.of(args).collect(Collectors.joining(" ")));
}
// spawn a subprocess to obtain the IPv4 address
String tmp = lookupWithIPv4Prefer();
System.out.println("IPv4 lookup results: [" + tmp + "]");
if (SKIP.equals(tmp)) {
System.out.println(HOST + " can't be resolved - test skipped.");
return;
}
String[] strs = tmp.split(":");
addr = strs[0];
ipv4Name = strs[1];
// check that the reverse lookup of the IPv4 address
// will succeed with the IPv4 only stack
tmp = reverseWithIPv4Prefer(addr);
System.out.println("IPv4 reverse lookup results: [" + tmp + "]");
if (SKIP.equals(tmp)) {
System.out.println(addr + " can't be resolved with preferIPv4 - test skipped.");
return;
}
strs = tmp.split(":");
ipv4Reversed = strs[1];
// Now check that a reverse lookup will succeed with the dual stack.
InetAddress ia = InetAddress.getByName(addr);
String name = ia.getHostName();
// output details of dual stack lookup by address
System.out.println("dual stack lookup for addr " + addr + " returned IP address " + ia);
System.out.println(" with hostname " + name);
System.out.println("(default) " + addr + "--> " + name
+ " (reversed IPv4: " + ipv4Reversed + ")");
if (!ipv4Name.equals(name)) {
// adding some diagnosting
System.err.println("name=" + name + " doesn't match expected=" + ipv4Name);
System.err.println("Listing all adresses:");
for (InetAddress any : InetAddress.getAllByName(HOST)) {
System.err.println("\t[" + any + "] address=" + any.getHostAddress()
+ ", host=" + any.getHostName());
}
// make the test fail...
throw new RuntimeException("Mismatch between default"
+ " and java.net.preferIPv4Stack=true results");
}
}
static String lookupWithIPv4Prefer() throws IOException {
String testClz = Lookup.class.getName();
ProcessBuilder pb = ProcessTools.createTestJavaProcessBuilder(
"-Djava.net.preferIPv4Stack=true", testClz);
return new OutputAnalyzer(pb.start()).getOutput();
}
static String reverseWithIPv4Prefer(String addr) throws IOException {
String testClz = Lookup.class.getName();
ProcessBuilder pb = ProcessTools.createTestJavaProcessBuilder(
"-Djava.net.preferIPv4Stack=true", testClz, "reverse", addr);
return new OutputAnalyzer(pb.start()).getOutput();
}
}
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